PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 105 



Body ratlier robust, the back somewhat elevated.. Head depressed, 

 but rather long aud pointed, the snout low and flat, somewhat acute in 

 outline. Length of snout from mouth just equal to the distance be- 

 tween the angles of the mouth, about half greater than the distance 

 from the line connecting the angles of the mouth, forward to the chin. 

 Eye moderate, a little nearer nostril than angle of mouth ; distance from 

 eye to nostril nearly two-thirds distance from nostril to tip of snout. In- 

 terorbital width less than half distance from snout to first gill-opening, 

 slightly more than length of snout measured from eye. 



Angle of mouth with a pit from which radiate three very short furrows- 

 Nostrils not far from margin of head, their length equal to diameter of 

 eye aud rather less than half their distance from eye, the flap on the an- 

 terior margin nearly obsolete. 



Teeth of both jaws narrowly triangular, nearly erect and not evidently 

 notched on the outer margin ; all the teeth distinctly though finely ser- 

 rated on both margins. Lower teeth considerably narrower than upper 

 and somewhat flexuous, more faintly serrate ; their roots broad. Num- 

 ber of teeth about f |. 



Head without conspicuous pores. Gill-openings rather large, the last 

 one shorter than the others, above base of pectoral, the depth of the 

 middle one about equal to distance from nostril to middle of eye; the 

 branchial area about half longer than broad. 



Free margins of all the fins concave. Insertion of first dorsal close 

 behind base of pectorals, its distance from the latter being not more 

 than the diameter of the eye. 



Anterior lobe when depressed extending beyond posterior lobe; dis- 

 tance from baseof posterior lobe to ventrals somewhat more than length 

 of snout from mouth. Length of base of first dorsal somewhat less than 

 vertical height of the fin and equal to interorbital width. Distance be- 

 tween dorsals 2 to 2^ times base of first dorsal, aud about 4 times base 

 of second. 



Second dorsal much smaller than tirst ; its posterior lobe longer than 

 anterior and somewhat longer than baseof fin, reaching to within 1^ eyes' 

 breadth of the large pit at root of caudal. Base of second dorsal nearly 

 half length of first dorsal. 



Lower lobe of caudal subfalcate, moderately pointed, two-fifths length 

 of upper lobe, which is a little more than one-fourth the total length, 

 and a little less than distance from snout to posterior part of root of 

 pectorals. Anal a little longer than second dorsal and inserted nearly 

 opposite its front; its posterior lobe extending considerably beyond the 

 anterior when reflexed ; length of its base nearly equal to its distance 

 from caudal, a little less than distance from its front to ventral. Ven- 

 trals moderate, their anterior margins about three-fourths distance be- 

 tween angles of mouth. 



Pectorals rather large, somewhat falcate, twice as long as broad, 

 reaching to about opposite posterior part of base of dorsal, their tips 



